All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.064 Acetamides D000081 +
    D02.065.064.650 Piracetam D010889 
 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.038 Acetic Acids D000088 +
     D02.241.081.038.108 Acetamides D000081 +
      D02.241.081.038.108.650 Piracetam D010889 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.773 Pyrrolidines D011759 +
    D03.383.773.812 Pyrrolidinones D011760 +
     D03.383.773.812.555 Piracetam D010889